david mckenzie reports now from neighboring nairobi, kenya. >> reporter: they are left with a wider war in the center of africa. the m23 rebel group took a key town on friday of government forces and alliance militia. thousands of civilians were seen flying, sometimes carrying all their possessions on their backs. the u.k. charity says that more than 100,000 people need humanitarian assistance in this crisis. now there's a move to try to solve the growing conflict at the negotiating table. the mrekz have been summoned to use quanneda to try to find a way to find peace, but the international observers believe that because the u.n. peacekeeping force watched as m23 took the key city of goma earlier this week, they might be emboldened to push on. they say they want to "liberate" the entire of the country and move all the way 1,000 miles away. >>> a dangerous new record reached. a report says that there are more greenhouse gases in the atmosphere now than ever before. we'll talk to bill nigh, the science guy, there he is, about what it means for the health of our planet. um, my mom's car an